"This has been Donald Trump's playbook for so long, and when they go low, we go vote," Perez added.

Trump and other Republicans have sought to focus their messaging on immigration ahead of next week's midterm elections, while Democrats have kept their attacks centered on GOP efforts to repeal the Affordable Care Act last year, which failed in Congress.

Democrats are hoping to net at least 23 seats in the House and two in the Senate as the party attempts to regain control of both chambers of Congress this year.